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Grey Matter: Very fun to draw but just based on frogs in my brain, I honestly could not settle for a single design except maybe the bottom two on the second row.

Heat Blast: I like to think that Pyronites can have much more diverse faces and it's something that's easily changed throughout their lives since how high energy they are, they can kinda just mold a new face from the non-plasma material of their body. Also the gaps in Heat Blasts face reminded of horns and thus why parts of some designs are pointer.

XLR8: My beloved weirdo alien. 100% believe they both possess an endo and exo skeleton. I think the mask covering that comes down is similar to the way insect wings fold out except now as a covering of sorts. Here are some ideas as to how the covering could look too:

Four Arms: No thoughts, only punch